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In this Nov. 7, 2008, file photo a soldier stands guard during the presentation in Mexico City of arms, captured in the largest seizure of Gulf drug-cartel weapons to date, about 288 assault rifles, 500,000 rounds of ammunition, numerous grenades and several .50-caliber rifles. As the State Department says firearms obtained in the U.S. account for an estimated 95 percent of Mexico's drug-related killings, gun rights groups increasingly worry that an outbreak in violence at the U.S.-Mexico border could pave the way for a raft of new gun control measures. (AP Photo/Gregory Bull, File)
/ AP